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NADH Fluorescence Imaging of Isolated Biventricular Working Rabbit Hearts
Published on: July 24, 2012
静脉动心率和形态决定了 transthoracic 心脏转变的能量和电流需求
R E Kerber1, M G Kienzle, B Olshansky
1University of Iowa, Iowa City.
Circulation
|January 1, 1992
概括
静脉动脉 (VT) 和动 (VF) 需要不同的电能来终止. 静脉转速率和QRS形态显著影响跨胸部心脏转变的成功,较慢的单形静脉转需要更少的能量.
科学领域:
- 心脏病学 心脏病学
- 电子生理学 电子生理学
- 医疗器械 医疗器械
背景情况:
- 终止腹腔动脉节律失常症的电流和能量需求因类型而异.
- 腹腔动脉短拍 (VT) 通常被认为比腹腔动 (VF) 需要更少的能量.
- 这项研究假设VT速率和QRS复杂形态影响过胸腔VT终止能量需求.
研究的目的:
- 调查VT速率和QRS复杂形态对VT终止的跨胸前电流要求的影响.
- 为了比较不同电流水平在终止各种心室动脉节律失常症的有效性.
主要方法:
- 对203名患者进行前性研究,其中569名患者因静脉动或静脉动而接受过胸外冲击.
- 使用基于电流的协议,在18A启动VT冲击,在25-30A启动VF冲击.
- 根据QRS形态和心率,心室动脉节律障碍被分类为单态静脉节律 (MVT),多态静脉节律 (PVT) 或VF.
主要成果:
- 低电流冲击 (18A,25A) 对MVT (69-82%) 比PVT (33%) 或VF (19-53%) 更成功.
- 较高的电流 (35A,40A) 在所有三种心律失常类型中都显示出相同的成功率.
- 较慢的MVT (心率<200bpm) 在低电流冲击中成功率明显高于更快的MVT (89%vs72%).
结论:
- 心率和QRS复杂组织是跨胸部能量和当前对心脏转变/除的需求的关键决定因素.
- 单态VT终结需要相对较低的电流,而PVT和VF需要更高的能量水平.
- QRS形态,轴或持续时间并没有显著改变目前对于腹腔动脉节拍终止的要求.
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